Trammel-holder.



PATBNTED OCT. 10, 1905.

0. W. HBOK.

TRAMMEL HOLDER.

APPLICATION FILED AUG.26,1904.

flu 5 wi 6 7 3.

UNITED STAT ES PATENT OFFICE.

Specification of Letters Patent.

Patented Oct. 10, 1905.

Application filed ugust 26, 1904. Serial No. 222,207.

To (1]! when it may concern.-

Be it known that I, OLIVER V. HECK, a citizen of the United States, residing at Leetonia, in the county of Oolumbiana and State of Ohio, have invented certain new and useful Improvements in Tlrammel-Holders, of which the following is a specification.

This invention relates to drafting appliances of the type known as trammels or beamcompasses, and has special reference to an improved trammel-holder embodying simple and practical means for firmly holding in properlyadjusted position the trammel-points or equivalent tools.

To this end the invention primarily contemplates a tool holding or fastening device for trammel-points and like tools, said device providing for every necessary adjustment of the point or tool, while at the same time providing for rigidly clamping or binding the same in their adjusted positions without the necessity of perforating the tool-fastening bolt, as has heretofore been necessary in other types of tool-holding devices or trammel-points.

A further object of the invention is to provide, in a preferred form of the device, means for not only adjustably clamping the trammel-point to its holder and providing for the adjustment of the holder along the bar or beam, but also for tilting the trammel point or tool to diagonal or oblique positions without disturbing the fastening means therefor.

Another object of the invention is to provide an improved trammel-holder s0 constructed that the same may be utilized as a surfacegage.

lVith these and many other objects in view, which will more readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination, and arrangement of parts which will be hereinafter more fully described, illustrated, and claimed.

The essential features of the invention involved in carryingout the objects above indicated are necessarily susceptible to structural change without departing from the scope of the invention; but preferred embodiments thereof are shown in the accompanying draw ings, in which Figure l is a general view of a beam-compass or trammel embodying holders constructed in accordance with the present invention. Fig. 2 is a perspective view of that form of the holder which includes a tiltable carrierplate to effect the oblique adjustments of the trammel point or tool. Fig. 3 is a perspective View of the complete holder shown in Fig. 2, illustrating the several elements thereof separated. Fig. at is a vertical central sectional view of the trammel-holder illustrated in Fig. 2. Fig. 5 is a perspective view showing the trammel-holder arranged for use as a surface-gage. Fig. 6 is a perspective view of another form of the invention wherein the tiltable carrier-plate for oblique adjustments is omitted.

Like reference-numerals designate corresponding parts in the several figures of the drawings.

In the ordinary use of the invention a pair of the trammel-holders, carrying trammelpoints or like tools, are designed to be clamped to the compass bar, rod, or beam (designated by the numeral 1) and employed in the usual way, so, as the present invention involves no change in the manner of using the holders upon the compass-bar, particular reference will be made to structural features forming the subject-matter of the claims.

The body of the trammel-holder is in the conventional form of a yoke of U shape, and therefore constitutes a yoke-clamp body (designated in its entirety by the numeral 2) and designed to be applied to and adjusted along the compass bar, rod, or beam, according to the separation desired between the separate trammel holders upon the bar. The said clamp-body 2 essentially comprises an upright flat-faced side member 3 and the upper and lower parallel arms 4 and 5, projected from the same side of the member 3 respectively at the upper and lower ends thereof, so as to project over the compass-bar, to which the holder is fitted. The upper clamp-arm L is provided with a threaded opening therein to receive the usual clamp-screw 6 for clamping the body upon the compass-bar, while the lower arm 5 is formed with a perfectly fiat bottom face 7, whereby the said lower arm may be utilized as a supporting-base for the holder when the same is to be employed as a surface-gage, as will hereinafter more fully appear.

The trammel-point, pencil, or equivalent tool that may be employed for scribing or marking purposes and designated by the numeral 8 in the drawings is designed to be clamped in its adjusted position in front of the upright side member of the clamp-body 2 through the agency of the tool-holding device. This tool holding device essentially consists of a tool-fastening bolt 9, a clamp- IIO washer 10," and a binding-nut 11, cooperating to permit the vertical adjustment of the tool 8,- while also providing for rigidly clamping the same against movement after the proper adjustment thereof. This is accomplished by clamping the tool 8 in front of the clamp-body and at one side of the tool-fastening bolt 9, and in addition to the elements enumerated the preferred form of the invention embodies a tiltable carrier-plate 12, placed flat upon the outer face of the side member 3 of the clamp and pivotally supported on the tool-fastening bolt 9, as may be plainly seen in Figs. 2, 3, and 1 of the drawings. The said tiltable carrier-plate 12 may be rocked upon the fastening-bolt 9 to provide for giving the desired angle to the trammel point or tool, and at one side of its pivotal point and at the opposite ends thereof the said carrier-plate 12 is provided with oppositely-located offset open restseats 13, disposed at one side of the plane of the pivot-opening 1 1 through the carrier-plate and constituting rigid bearing-points within and against which the trammel point or tool 8 is firmly clamped by the cooperating action of the fastening-bolt 9, the washer 10, and the binding-nut 11.

To provide for tilting the carrier-plate 12 in either direction and for holding it rigid in its adjusted position, there is employed a pair of oppositely-located adjusting-screws 15, mounted in threaded openings formed in the v bearing-lugs 16, projected outwardly from the upper corner of the clamp-body 2. The inner ends of the adjusting-screws 15 are arranged in opposing relation and are disposed, respectively, upon opposite sides of the upper end of the carrier-plate 12, so that by a manipulation of the two'screws the desired tilting adjustment and holding of the carrier-plate may be accomplished.

Referring in detail to the holding device per se, the tool-fastening bolt 9 is imperforate and is designed to be detachably inserted through the bolt-hole 17, formed at an intermediate point in the upright side member 3 of the clamp-body. The bolt is formed at one end with a head 18, which lies within a countersink at the inner side of the bolt-hole 17, and the outer threaded end portion of the bolt beyond the side member of the clampbody carries thereon the carrier-plate 12, the clamp-washer 10, and the binding-nut 11. The said clamp-washer 10 is in the form of a hollow cap-piece, having in its holding-flange 18 alined oppositely-arranged tool-engaging notches 19. One or more pairs of these notches may be formed in the flange of the washer 10 and usually of different sizes to adapt the same washer to different thicknesses of toolpoints 8; but in all cases the tool-engaging notches of each pair are disposed at one side of the plane of the bolt-hole through the washer, so as to properly engage over and bind against the tool-point 8, which is likewise arranged at one side of the axial or longitudinal plane of the tool-fastening bolt.

On its outer side the clamp-washerlO is formed with a conveXed boss 20, which is designed to be engaged by the complemental concave face 21, provided at the inner end of the recessed binding-nut 11, which works upon the outer threaded extremity of the tool-fastening bolt. The recess in the binding-nut accommodates a pressure-spring 22, bearing on the outer side of the clamp-washer and assisting to hold the head of the bolt closely within its countersink during the loosening as well as the tightening of the binding nut. A special object of this construction resides in the fact that by reason of the washer being formed with a convexed boss 20 and the nut with a concaved face 21 the ,washer is free to tilt to any position to readily accommodate different sizes of trammel points or needles. This is impossible in constructions employing flatly-contacting nuts and washers.

While the tiltable carrier-plate 12 is an important part of the invention and increases the range of utility of the trammel-holder, still the tool-holder or fastening device per 86 can be employed without such plate, as shown by the modification in Fig. f the drawings. The clamp action of the tool holding or fastening device is the same in this modification, and with the omission of the carrier-plate 12 it is only necessary to provide the clamp-body at the upper and lower ends thereof with offset open-rest seats 13, corresponding in function to the seats 13, previously referred to.

Should it be desired to employ one of the trammel-holders as a surface-gage, the gagetool 8 may be clamped by the tool holding or fastening device in a position crosswise of the front side of the clamp-body and a bodyweight 23, such as a nut or the like, clamped, within the body 2 by the screw 6 to give sufficient weight to the'holder. With the parts thus arranged the flat supporting-base 5 of the trammel-holder simply rests upon a table, board, or other surface upon which the appliance may be shifted for surface-gage work.

From the foregoing it is thought that the construction, operation, and many advantages of the herein-described trammel-holder will be readily apparent without further description, and it will also be understood that various changes in the form, proportion, and minor details of construction may be resorted to without departing from the scope of the invention or sacrificing any of the advantages thereof.

Having thus described the invention, what is claimed, and desired to be secured by Letters Patent, is

1. In a device of the class described a clampbody having oppositely-located rest-seats for the trammel-point or equivalent tool, and a tool-holding device comprising a bolt mounted in one side of the body, a clamp-washer arranged on the bolt and having tool-engaging portions disposed at one side of the bolt, said washer being free to turn upon the bolt and also provided upon its outer side with a rounded boss, a recessed binding-nut having a rounded concavity receiving said boss and permitting the same to have a movement therein to accommodate tilting movements of the washer and its adaptation to differentsized tools, and a pressure-spring arranged within the nut and bearing on said boss.

2. In a device of the class described, a clampbody, a tool-fastening bolt carried by the body, a tiltable carrier-plate pivotally mounted on the bolt, adjusting and holding means carried by the clamp-body and arranged at opposite sides of said plate to effect oblique adjustments thereof, and clamping elements arranged upon the bolt and comprising means for clamping the tool to the carrier-plate at one side of the bolt.

3. In a device of the class described, a clampbody having a flat outer side, a tool-fastening bolt carried by the body and projecting beyond said fiat side, a tiltable carrier-plate arranged against the flat side of the clampbody and pivotally mounted on the bolt, said carrier-plate having oppositely-located restseats for the tool adjusting and holding means carried by the clamp-body and arranged to engage opposite sides of the plate for adjusting the position thereof, and clamping elements arranged upon the bolt and comprising means for holding the tool in the rests of said plate.

4. In a device of the class described, a clampbody having a pair of spaced oifstanding bearing-lugs, a tool-fastening bolt carried by the body, a tiltable carrier-plate pivotally mounted on the bolt and having rest-seats for the tool disposed in a plane at one side of the bolt, opposite adjusting-screws mounted in said lugs and having their inner ends disposed respectively at opposite sides of the carrierplate, and clamping elements arranged upon the bolt for clamping the tool to the carrierplate.

In testimony whereof I aflix my signature in presence of two witnesses.

OLIVER WV. HECK.

\Vitnesses:

JOHN B. MoRoAN, G. H. IRWIN. 

